Java.util.function.BiPredicate interface in Java with Examples

The BiPredicate<T, V> interface was introduced in JDK 8. This interface is packaged in java.util.function package. It operates on two objects and returns a predicate value based on that condition. It is a functional interface and thus can be used in lambda expression also.

public interface BiPredicate<T, V>

Methods

  1. test(): This function evaluates a conditional check on the two objects, and returns a boolean value denoting the outcome.



    boolean test(T obj, V obj1)
    
  2. and(): This function applies the AND operation on the current object and the object recieved as argument, and returns the newly formed predicate. This method has a default implementation.

    default BiPredicate<T, V> and(BiPredicate<? super T, ? super V> other)
    
  3. negate(): This function returns the inverse of the current predicate i.e reverses the test condition. This method has a default implementation.

    default BiPredicate<T, V> negate() 
    
  4. or(): This function applies the OR operation on the current object and the object recieved as argument, and returns the newly formed predicate. This method has a default implementation.

    default BiPredicate<T, V> or(BiPredicate<? super T, ? super V> other)
    

Example:

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// Java example to demonstrate BiPredicate interface
  
import java.util.function.BiPredicate;
  
public class BiPredicateDemo {
    public static void main(String[] args)
    {
        // Simple predicate for checking equality
        BiPredicate<Integer, String> biPredicate = (n, s) ->
        {
            if (n == Integer.parseInt(s))
                return true;
            return false;
        };
  
        System.out.println(biPredicate.test(2, "2"));
  
        // Predicate for checking greater than
        BiPredicate<Integer, String> biPredicate1 = (n, s) ->
        {
            if (n > Integer.parseInt(s))
                return true;
            return false;
        };
  
        // ANDing the two predicates
        BiPredicate<Integer, String> biPredicate2
            = biPredicate.and(biPredicate1);
        System.out.println(biPredicate2.test(2, "3"));
  
        // ORing the two predicates
        biPredicate2 = biPredicate.or(biPredicate1);
        System.out.println(biPredicate2.test(3, "2"));
  
        // Negating the predicate
        biPredicate2 = biPredicate.negate();
        System.out.println(biPredicate2.test(3, "2"));
    }
}

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Output:

true
false
true
true

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/function/BiPredicate.html



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